Bump google.golang.org/grpc from 1.29.1 to 1.56.3 (#564)

Bumps [google.golang.org/grpc](https://github.com/grpc/grpc-go) from 1.29.1 to 1.56.3.
- [Release notes](https://github.com/grpc/grpc-go/releases)
- [Commits](grpc/grpc-go@v1.29.1...v1.56.3)

---
updated-dependencies:
- dependency-name: google.golang.org/grpc
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Lorenzo Mangani <[email protected]>

Author: dependabot[bot]

go.mod

@@ -6,14 +6,14 @@ require (
 	github.com/VictoriaMetrics/fastcache v1.5.7
 	github.com/antonmedv/expr v1.8.8
 	github.com/buger/jsonparser v1.1.1
-	github.com/cespare/xxhash/v2 v2.1.1
+	github.com/cespare/xxhash/v2 v2.2.0
 	github.com/fortytw2/leaktest v1.3.0 // indirect
 	github.com/go-sql-driver/mysql v1.5.0
 	github.com/gobwas/httphead v0.0.0-20180130184737-2c6c146eadee // indirect
 	github.com/gobwas/pool v0.2.0 // indirect
 	github.com/gobwas/ws v1.0.3
 	github.com/gogo/protobuf v1.3.2
-	github.com/golang/snappy v0.0.1
+	github.com/golang/snappy v0.0.4
 	github.com/lib/pq v1.10.9
 	github.com/mailru/easyjson v0.7.1 // indirect
 	github.com/negbie/cert v0.0.0-20190324145947-d1018a8fb00f
@@ -25,10 +25,9 @@ require (
 	github.com/prometheus/common v0.26.0
 	github.com/robfig/cron/v3 v3.0.1
 	github.com/sipcapture/golua v0.0.0-20200610090950-538d24098d76
-	github.com/stretchr/testify v1.7.0
+	github.com/stretchr/testify v1.8.3
 	github.com/valyala/bytebufferpool v1.0.0
 	github.com/valyala/fasttemplate v1.1.1
-	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
-	google.golang.org/genproto v0.0.0-20200619004808-3e7fca5c55db // indirect
-	google.golang.org/grpc v1.29.1
+	golang.org/x/sync v0.1.0
+	google.golang.org/grpc v1.56.3
 )